The ability of an agent of infection to produce disease. The virulence of a microorganism is a measure of the severity of the disease it causes.

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    A microorganism that is smaller than a bacterium that cannot grow or reproduce apart from a living cell. A virus invades living cells and uses their chemical machinery to keep itself alive and to replicate itself. It may reproduce with fidelity or with errors (mutations); this ability to mutate is responsible for the ability of […]

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